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CVE-2021-39341

HIGH 8.2 CVSS 3.1
Published
November 1, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@wordfence.com
Weakness
CWE-285, CWE-319, CWE-863
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Description

The OptinMonster WordPress plugin is vulnerable to sensitive information disclosure and unauthorized setting updates due to insufficient authorization validation via the logged_in_or_has_api_key function in the ~/OMAPI/RestApi.php file that can used to exploit inject malicious web scripts on sites with the plugin installed. This affects versions up to, and including, 2.6.4.

Affected WordPress components

  • Popup Builder & Popup Maker for WordPress – OptinMonster Email Marketing and Lead Generation Plugin · optinmonster
    Confirmed match Active
    From 2.6.4 (including) to 2.6.4 (including); Up to and including 2.6.4
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • OptinMonster OptinMonster — From 2.6.4 (including) to 2.6.4 (including)
  • optinmonster optinmonster — Up to and including 2.6.4

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/optinmonster/trunk/OMAPI/RestApi.php?rev=2606519#L1460 Third Party Advisory
  • wordfence.com https://wordfence.com/vulnerability-advisories/#CVE-2021-39341 Third Party Advisory
  • www.wordfence.com https://www.wordfence.com/blog/2021/10/1000000-sites-affected-by-optinmonster-vulnerabilities/ Exploit, Third Party Advisory
  • nvd.nist.gov Official NVD record